Paper-cutting machine.



PATENTED JULY 17, 19-0 F..'L. GROSS. PAPER CUTTING MACHINE.

Arrmonmx rILnn III-H.119, I902.

a annua -sum 1 0., WASHINGTON, n. r

PATBNTED JULY. 17, 1906.

I. L. GROSS. PAPER (HITTING MACHINE.

APPLIQATIOH FILED JULY 19. 1902.

3 8HEETBSHEBT 2.

THE NORRIS PETERS cc, WASHINOTGN DCIL No. 826,480. 'PA-TENTEDJULY 17,1906.

P.- L. (moss. I PAPER GUTTING} MACHINE.

' APPLIO ATION FILED JULY 19, 1902.

3 GHEETS-SHHET 3.

II II II l lI 0.. WASHINGTON. o. c.

UNITED srArns FRANK L. CROSS, OF MYSTIC, OONNE FEEDER COMPANY, OFBOSTON, MAINE.

PATENT OFFICE.

PAPER-CUTTING MACHINE.

Specification of Letters Patent.

Patented July 17, 1906.

Application filed July 19,1902. Serial No. 116,193.

To all whom, it fitcty concern:

Be it known that I, FRANK L. Cnoss, of Mystic, in the county of NewLondon and State of Connecticut, have invented certain new and usefulImprovements in Paper-Cutting Machines, specification.

The invention relates to paper-cutting machines, and more especially tothe mechanism for clamping and holding the paper during the cutting.

It is desirable in paper-cutting machines that the clamp be forced downupon the paper with substantially the full clamping pressure prior tothe engagement of the knife with the paper, so that the top sheet shallnot be drawn or displaced by the action of the knife in beginning thecut. The clamping pressure should also be continued until the cutting iscompleted, so that the bottom sheets may not be displaced. It is alsodesirable that the clamping pressure may be readily varied for differentkinds of Work. In order that a machine may be operated with accuracy andcertainty, it is also im portant that the clamping pressure should beuniform during the cut and also the same for successive cuts whileoperating upon the same class of work and with a given adjustment of theparts. Automatic clampingcutters have not fulfilled these conditions,and for that reason it has been customary to employ hand-operated clampsupon machines for doing certain classes of work where accuracy andcertainty in the clamping and cutting are important. The reason for thisis that in these automatic clamping-machines the clamping pressure waseither dependent upon the resistance oflered to the knife by the paperor was dependent upon the frictional connection between the members of afriction-clutch. In the first case the clamping did not precede theengagement of the knife with the paper and the clamping pressure variedduring the cutting, with the resulting uncertainty and danger ofinaccuracy in the operation. In the second case there was no certaintyand uniformity of action, owing to the wide and unavoidable variation inthe resistance required to cause a frictionclutch to slip, even when theconditions are as nearly uniform as practicable.

The object of the invention is to provide a cutter in which the clamp isautomatically of which the following is a.

operated to clamp the paper with a pressure which shall be definite anduniform forsuc cessive operations and which is therefore adapted for useunder the conditions and'for. the classes of work which heretoforerequired machines having hand-operated clamps- To this end the primaryfeature of the invention consists in providing mechanism forautomatically operating the clamp which is thrown out of action when thepressure between the clamp and paper reaches an amount which is definiteand unvarying for any given adjustment.

The means which I prefer to employ for throwing the clamp-operatingmechanism out of operation comprises a movable part introduced into theconnections between the driver and the clamp, the movement of whichrelatively to the other parts of the connections is at each operationdependent upon an unvarying and definite resistance to the movement ofthe clamp and which by its movement causes the driver to be disconnectedand the operating mechanism to be thus thrown out of operation. The formand arrangement of this movable part is immaterial so far as the broadscope of my invention is concerned, asI believe I am the first to insurea definite clamping pressure by mechanism which automatically operatesthe clamp and that I am also the first to disconnect the driver for theclamp-operating mechanism by a part the movement of which to disconnectthe driver requires a pressure between the clamp and paper which isunvarying for a given adjustment and may be predetermined. After theclamp has been applied with the predetermined pressure it may be held inthis position by any suitable devices, and these devices may be eitherincluded in the connections between the driver and clamp or may bearranged. outside said connections, and these devices may act merely tolock the clamp in position or may act to maintain an active pressure onthe clamp. I prefer to construct and arrange these devices so that thereis an active pressure equal to the clamping pressure, or, in otherwords, I prefer to maintain the pressure of the clamp upon the paperduring the cutting, so that any compression of the paper by the knifewill not act to relieve the pressure of the clamp, as might happen undersome conditions if the clamp were merely locked in po on the clamp ICC 'clamping pressure for different classes of features of sition. Thisconstruction and arrangement of the devices for holding the clamp uponthe paper also forms one of the features of my invention, which while itis not essential to the primary feature is important in insuring themost efficient and accurate operation under all conditions.

, A further feature consists in so constructing the devices whichdetermine the clamping pressure requisitefor throwing out the op eratmgmechanism that they may be readily adjusted to vary the pressure fordifferent classes of work and varying conditions. In combining thesefeatures with the primary feature of the invention I prefer to providecounterbalancing means-such, for instance, as 1". v cF-ht springforresisting the movement of the movable part which throws out theclamp-operating mechanism and to so arrange this means that it willyield whenthe pressure between the clamp and paper overbalances theforce of the counterbalancing means. The yielding of thecounterbalancing means allows the movable part to move and by itsmovement to throw out the clan11 operating mechanism, after which thepres sure of the clamp is maintained by the counterbalancing meansacting to force the clamp onto the paper with a pressure substantiallyequal to the pressure which caused the yielding of said means. Thisarrangement also lends itself readily to the variation of the work,since by adjusting the counterbalancing means to offer a reater or lessresistance to the movement of the movable part the clamping pressure isvaried. With this construction, in which the spring or weight measuresand determines the clamping pressure ,it is evident that the clampingpressure may be I accurately regulated and that at each operation theclamping pressure will be the same definite amount. It is also evidentthat with the spring or weight arranged to react upon the clamp when theoperating mechanism is thrown out a uniform pressure upon the pa- -perwill be maintained throughout the cutting operation. In embodying thesemain my invention in an automatic cutting-machine I have employed otherfeatures "of invention which are not essential to the main features, butwhich contribute to the efficiency and simplicity of the machine.

The various features of the invention will be best understood from adetailed description of this machine, which I have illustrated I in theaccompanying drawings, in which Flgure 1 1s a front elevatlon. Fig. 2 1sa 'wsectional elevation, the section plane being just inside the leftend frame, Fig. 1. Fig. 3

- is a plan view with the paper-supporting table removed, and Fig. 4 isa detail view of mechanism to be described.

In the drawings, A indicates the knife-bar, mounted in guides in the endframes of the 'member of a clutch A of the clutch is secured to thedrivmg-shaft a as the pawl machines. The knife-bar is supported andcarried by yokes A, provided with rolls A which engage slots A ,-formedin the bar, the upper ends of the yokes engaging the top of the bar. Asthe bar is drawn down it is moved transversely to give a draw cut bymeans of a link A*, pivoted to the bar and frame. The yokes A areconnected by links A with the ends of arms A, which are secured to arock-shaft A The shaft A is rocked to reciprocate the knife-bar by meansof a crank A carried by a gear A and engaging a slot A formed in an armA, secured to the shaft A The gear A is driven through. a pinion Alooselymounted upon the driving-shaft B and connectedwith one The othermember B, and the clutch is engaged and disengaged by the movement of acone A arranged to operate upon the clutch-arms A The clutch-operatingcone A is moved by means of a yoke A loosely mounted on a shaft a andprovided with arms engaging an-annular groove in the cone A The yoke isoperated to engage the clutch A by the movement of a hand-lever Asecured'to a rock-shaft A, which is connected with the yoke A by meansof an arm A, having a slot which engages a pin A on the yoke. Byoperating the handle A the clutch A may be engaged to connect pinion Awith the driving-shaft, and thus start the knife-operating mechanism.After the gear A has made a revolution and the knife-bar has been drawndown and returned to its upper position the yoke A is moved in theopposite direction todisengage the clutch by means of apawl a, carriedby an arm c and arranged to engage a pin a Fig. 2, on the yoke. The arma/is secured to the rock shaft-0f, which is operated from the knife-operating arm A by means of an arm a secured to the shaft and connected tothe upper end of a'rod 0, the lower end of which passes through a lug aon the arm A and carries nuts (1 The nuts a are so adjusted that as theknife-bar reaches its upper posltion the lug a strikes the nuts anddraws down rod (i thus rocking shaft a This movement of shaft-a carriespawl a to the left, thus disengaging clutch A The lug a now prevents anymovement of shaft a in the opposite direction until the arm A has beenstarted upward. The pawl a must therefore be disengaged from the pin ato allow the yoke A to be moved to the right in starting theknife-operating mechanism. This is done automatically by a cam-surface aarranged to engage the end of a screw moves to the left and lift thepawl out of engagement with the pin a When the armA has started up andreleased the shaft a the shaft is rocked to carry the pawl intoengagement with the pin a by rea- IIS 'se eo son of the connection ofthe shaft'a mechanism to be described.

The driving-shaft is provided pulley B and a loose pulley B with with atight for carrying operating mechanism out of operation. Thelongitudinal movement of the shaft D is resisted by the pressure of anarm F on the end of the shaft. This arm is secured to a shaft thedriving-belt, through which power is I F, and the pressure which it willapply to the supplied to drive the machine.

The paper is held during the action of the knife by means of a clamp C,mounted in guides C in the end frames and secured to the upper end ofbars 0 The clamp is raised and is held in a raised position by theaction of a weight C acting through suitable connections. The weight issecured to an arm G which projects rearwardly from a treadle C looselymounted on the shaft A The treadle is connected by a link C with an armC secured to a rock-shaft C, which carries arm 0 the outer ends of whichare provided with slots engaging pins C. on the bars C By operating thetreadle the clamp may be brought down upon the paper and will bereturned by the weight when the treadle is released.

The mechanism for operating the clamp automatically is connected withthe clamp through the bars G which are provided with rack-teeth at theirlower ends arranged to be engaged by pinions c, secured to a shaft 0.The shaft 0 is connected with and disconnected from the other parts ofthe clamp-operating mechanism by means of a clutch, one member 0 ofwhich is keyed to slide on the shaft 0 and the other member of which isformed on a worm-wheel c loose on the shaft. The clutch-sleeve c ispressed toward the worm-wheel by a spring 0 and is moved against thetension of the spring to disengage the clutch by a lever 0, having arms0 which engage an annular groove in the clutchsleeve. The engagement anddisengagement of the clutch is controlled from the knife-operatingmechanism. For this purpose the lever a is connected by a rod. 0 with anarm 0 secured to shaft a so that when the shaft a is rocked by theengagement of lug a with nuts a the clutch-sleeve 0 will be moved out ofengagement and held out against the tension of spring 0 until the arm Astarts upward again, when the spring 0 will engage the clutch-sleeve.This movement of the sleeve 0 will rock shaft 41 and carry pawl a intoengagement with pin a preparatory to the disengagement of clutch A Thusthe clutch-sleeve c is engaged with the worm wheel as theknife-operating mechanism starts and is disengaged to allow the clamp toreturn to its upper position as the knife bar reaches its upperposition.

The worm-wheel c is engaged and operated by a worm D, secured to a shaftD. This shaft and worm are so mounted that they may have a limitedlongitudinal movement, and they are one form of yielding part by theaction of the weight F introduced into the connections between thedriver and the clamp for throwing the clamp- I weight F end of the shaftD depends upon weights F secured upon arms F", which are secured to theshaft F. ne or more arms F and may be used and by adjusting the weighton the arm the resistance offered to the longitudinal movement of shaftD may be varied as desired. When the shaft D is rotated, the clamp willbe drawn down upon the paper, and when the clamp'bngages the paper theresistance to the mov ment of the clamp will create an endwise thrust onthe worm D, which thrust will beproportional to the pressure between theclamp and paper. This thrust is resisted by the weight F acting throughthe arms F and F, and the clamp will continue to be forced down onto thepaper until this thrust is suflicient to lift weight F after whichcontinued rotation of shaft D will cause a longitudinal movement of theshaft and a movement of arms F F and weight F The weight and connectionstherefore are one form of means for resisting t e movement of theyielding part which control the throwing out of the clamp-operatingmechanism with a definite and regulated pressure. The resistance offeredby the weight is definite and is the same each time the clamp isoperated, and therefore the clamp will always be applied to the paperWith a definite and fixed pressure, dependent upon the size andadjustment of the weight. The driver for operating the clamp consists ofa clutch D one member of which is loosely mounted on the shaft D and theother member of which is secured to the shaft. The loose member isconnected with a spiral gear D engaged and continuously driven byengagement with a spiral gear D secured to a shaft D, which carries aspiral gear D engaged by a spiral gear D, secured to the driving-shaftB. The clutch D is engaged and disengaged by the movement of a cone Darranged to engage the operating-arms D of the clutch. The longitudinalmove ment of the shaft D serves to operate the cone D to disengage theclutch, and thus throw the clamp-operating mechanism out of operation.To effect this, an arm F is secured to the shaft F, and the end of thisarm is connected, by means of a link F, with one end of a bell-cranklever F", the other end of which is provided with arms engaging anannular groove in cone D. When the shaft D is moved longitudinally byreason of the pressure between the clamp and paper, the shaft F isrocked and the clutch D disengaged. The pressure of the clamp is nowmaintained and the connections between said weight and the clamp, theworm D acting as a rack andthe wormlIO wheel as a gear to transmit thepressure applied to the shaft. Thus the clamp is forced onto the paperduring the cutting with full clamping pressure. As the knife-bar reachesits upper position an arm F secured to shaft A strikes the end of ascrew F mounted in an arm F secured to shaft F and rocks the shaft Fagainst the action of weight F This relieves the pressure upon theconnections between the shaft D and the clamp, so that the clutch-sleeve0 may be readily disengaged from the worm-wheel c to allow the clamp tore turn to normal position. When the knife crating mechanism is started,the arm F moves away from screw F thus causing the pressure to beapplied to the end of shaft D.

In the machine described the clamp-operating mechanism is controlledfrom the knifeoperating mechanism and is coupled with the clamp by thesame mechanism which throws the knife-operating mechanism intooperation, so that all the operations are automat ically performedwhenever the operator throws the knife-operating mechanism intooperation. It will be understood, however, t iat this arrangement is notessential, although it is advantageous in saving time. By reason of thefact that the automatic mechanism for operating the clamp isdisconnected for the return of the clamp the opera tor may bring theclamp down upon the paper by pressing on the treadle before starting themachine, and thus avoid any danger of displacement of the sheets by thesudden engagement of the clamp with the paper. This is of importance indoing some classes of work.

The parts are so timed that the clamp will engage the paper and theclutch D be disengaged before the knife strikes the paper, and the paperwill be clamped with full clamping pressure therefore before it isengaged by the knife. By varying the position of, the weight F the clampmay be made to clamp the paper with any desired force, and when theweight has been once adjusted for a certain clamping pressure the clampwill be applied to the paper with this pressure at each operation of themachine, thus enabling the paper to be clamped with even a greaterdegree of certainty and accuracy than has heretofore been practicablewith hand-operated clamps and without loss of time or the exercise ofskill or care on the part of the operator.

What I claim, and desire to secure by Letters Patent, is-

1. In a paper-cutting machine the combination of a clamp, mechanism forautomatically operating said clamp to clamp the paper and mechanism forthrowing said operating mechanism out of action when the clampingpressure reaches an unvarying definite or predetermined amount,substantially as described.

2. In a paper-cutting machine the combi- 1 nation of a clamp, mechanismfor automatically forcing the clamp u on the paper including a movablepart eac 1 operative movement of which requires the same definitepressure between the clamp and paper, and means whereby the movement ofsaid part throws said mechanism out of operation, substantially asdescribed.

3. In a paper-cutting machine the combination of a clamp, mechanism forautomatically operating said clamp to clamp the paper, mechanism forthrowing said operating mechanism out of action when the clampingpressure reaches a definite'or predetermined amount, and for activelymaintaining said pressure during the cutting, substantially asdescribed.

4. In a paper-cutting machine the combination of a clamp, mechanism forautomatically forcing the clamp upon the paper including a yielding partthrough Whichpressure is transmitted to the clamp, means for resistingthe yielding of said part with a definite and regulated force wherebythe pres sure of the clamp upon the paper is defined and measured,substantially as described.

5. In a paper-cutting machine the combination of a clamp, mechanism forautomatically forcing the clamp upon the paper including a yielding partthrough which pressure is transmitted to the clamp, means for resistingthe yielding of said part with a definite and regulated force, wherebythe pressure of the clamp upon the paper is defined and measured, andmeans for adjusting said force to vary the clamping pressure,substantially as described.

6. In a paper-cutting machine the combination of a clamp, mechanism forautomatically forcing the clamp upon the paper including a yielding partthrough which pressure is transmitted to the clamp, means for resistingthe yielding of said part with a definite and regulated force wherebythe pressure of the clamp upon the paper is defined and measured, adriver for said mechanism and means controlled by the movement of saidyielding part for disconnecting said driver, substantially as described.

7. In a paper-cutting machine the combination of a clamp, a driver andconnections for automatically forcing the clamp upon the paper, andmeans dependent for its operation upon'an unvarying and definiteresistance to the clamp for disconnecting said driver, substantially asdescribed.

8. In a paper-cutting machine the combination of a clamp, mechanism forautomat-' IIC ically forcing the clamp upon the paper, a

driver therefor, mechanism for disconnecting said. driver when theclamping pressure reaches an unvarying definite or redetermined amountand means for he ding the clamp in position during the cutting,substantially as described.

9. In a paper-cutting machine the combination of a clamp, a driver,connections beamp including a mounted to move means for forcing saidworm and through the longitudinal of disconnecting tween said driver andcl worm-wheel and a worm longitudinally, longitudinally with a definiteforce, means operated the worm against said force for said driver,substantially as described.

10. I nation of a cl Wheel and a worm mounted to move longitudinally, anadjustable weight for applying pressure to move said wormlongitudinally,

and means for disconnecting said driver through the movement of said.worm against the pressure of said weight, substantially as described.

11. In a paper-cutting machine the combination, of a paper-cuttingknife, operating mechanism for the knife, a paper-holding clamp,clamp-operating means, and automatical controlling means adapted toeffect the operative connection between the clamp and its operatingmeans for moving the clamp into engagement with the pile of sheets andto automatically disconnect the clamp from its operating means when theclamping pressure reaches an unvarying definite amount, substantially asdescribed.

12. In a paper-cutting machine, the combination of a paper-cuttingknife, operating mechanism for the knife, a paper-holding clamp,clampoperating means, automatic controlling means adapted to effect the0perative connection between the clamp and its operating means formoving the clamp into engagement With the pile of sheets and thenautomatically disconnect the clamp from its operating means when theclamping pressure reaches an unvarying definite amount, and means forautomatically disengaging the clamp from the pile of sheets after thecompletion of the cutting operation, substantially as described.

13. In a paper-cutting machine, the combination of a pile-supportingtable, a papercutting knife, means for operating said knife, apaper-holding clamp, operating mechanism adapted to move the clamp intoengagement with the pileand then automatically disengage itself from theclamp, and means for maintaining an active pressure on the clamp duringthe cutting, substantially as described.

In a paper-cutting machine, the combination of a pile-supporting table,a papercutting knife, means for operating said knife, a paper-holdingclamp, clamp-operating means, and means for counterbalancing thepressure between the clamp and paper adapted to automatically disconnectthe clampoperating means from the clamp when overbalanced by saidpressure, substantially as described.

11 a papercutting machine the combiamp, a driver, connections betweenthe driver and clamp including aworm- 15. In a paper-cutting machine thecombination of a pile-supporting table, a papercutting knife,knife-operating mechanism, a paper-holding clamp, clamp-operatingmechanism'having a yielding part, counterbalancing means resisting theyielding of said part, and means actuated by the yielding of said partadapted to automatically disconnect the clamp from its operatingmechanism, substantially as described.

16. In a paper-cutting machine the combination of a pile-supportingtable, a papercutting knife, its operating mechanism, a paper-holdingclamp, suitable clamp-operating mechanism having a yielding part,counterbalancing means resisting the movement of said part, meansactuated by the yielding of said part of the operating mechanism adapteto automatically disconnect the clamp from its operating mechanism, andmeans for automatically raising the clamp from the pile after thecompletion of the cutting operation, substantially as described.

In a paper-cutting machine the combination of a clamp, mechanism forautomaticallyforcing the clamp upon the paper, a counterbalancing devicefor determining the pressure between the clamp and paper, and mechanismfor disconnecting the clamp and operating mechanism upon the yielding ofthe counterbalancing device, substantially as described.

18. In a paper-cutting machine the combination of a clamp, mechanism forautomatically forcing the clamp upon the paper including a yielding partthrough which pressure is transmitted to the clamp, and acounterbalancing device for determining said pressure, substantially asdescribed.

19. In a paper-cutting machine the combination of a clamp, mechanism forautomatically forcing the clamp upon the paper including a yielding partthrough which pressure is transmitted to the clamp, and an adjustablecounterbalancing device for determining said pressure.

20. In a paper-cutting machine the combination of' a cutting-knife,knife-operating mechanism, a clamp, and mechanism auto matically forcingthe clamp against the work with the same definite pressure at successiveoperations, substantially as described.

In a paper-cutting machine the combination of a cutting-knife,knife-operating mechanism, a clamp, mechanism automatically forcing theclamp against the work With the same definite pressure at successiveoperations, and means for regulating said pressure, substantially asdescribed.

22. In a paper-cutting machine the combination of a cutting-knife,knife-operating mechanism, a clamp, mechanism automatically forcing theclamp against the work with the same definite pressure at successiveoperations, and mechanism for automatically redrivingshaft, clutchesmounted on said main turning the clamp after the cutting is completed,substantially as described.

23. In a cutting-machine having supporting-frames and a work-tableattached thereto, a driving-shaft revolubly mounted in bearings in saidsupporting-frames; auxiliary shafts revolubly mounted in saidsupporting-frames and driven from said driving-shaft by means ofclutches mounted thereon; a clamping-bar slidably mounted in saidsupporting-frames and operated by one of said auxiliary shafts; means onsaid auxiliary shafts for adjusting the amount of pressure exerted bysaid clamping-bar; means mounted on said auxiliary shaft forautomatically stopping the movement of said clamping-bar when apredetermined pressure is exerted by it a cutter-bar slidably mounted insaid supporting-frames and driven by the other auxiliary shaft; means onsaid auxiliary shaft for causing said cutter-bar to move toward thetable to cut material placed thereon and to return to its normalposition, and to automatically stop said auxiliary shaft when saidcutter-bar has been returned to its normal inoperative position; andmeans operated by said cutter-bar for returning the clamping-bar to itsnormal inoperative position.

24. In a pa )er-cutting machine the combination of supporting-frames, awork-table attached thereto, a main driving-shaft revolubly mounted inbearings in said supportingframes, intermediate shafts driven by saidshafts and driving-shaft, a clamping-bar slidably mounted in saidsupporting-frame and arranged to clamp the material to be out between itand the work-table, means for throwing said intermediate shafts intooperation, means operable by said intermediate shafts for causing theclamping-bar to be drawn toward the table, and means independent of thecutter-bar operable by a counterbalancing device whereby a givenpressure exerted upon the material to be cut by said clamp- ,'ingbarwill automatically stop its further supporting-frames and movement.

25. In a paper-cutting machine the combitached thereto, a maindriving-shaft revolu bly mounted in bearings in said supportingframe,means for revolving said main drivin g-shaft, intermediate shaftsmounted in said driven from said main driving-slnft, a cutter-barslidably mounted in said si'ipporting-frames, counterbalancing meansacting on one of said intermediate shafts for producing a predeterminedpressure upon the material to be clamped,means whereby said cutter-barwill be moved toward and 'from the worlr-table when said predetermined ipressure has been exerted, and means for antomatically stopping itsmovement when returned to its normal inoperative position.

26, In a paper-cutting machine the combination of supporting-frames anda work-table mounted thereon ,a main driving-shaft revolubly mounted inbearings in said supportingframes, auxiliary shafts revolubly mounted insaid supporting-frames and driven from said main shaft, a clamping-barand a cutterbar slidably mounted in said supportingframe and adapted tobe moved toward and from the work-supporting table to clamp and cutmaterial placed thereon, automatic means intermediate said maindriving-shaft and said clamping and cutting bars arranged to cause themto perform the following cycle of operations to wit, a counterbalancingdevice and means to cause the clamping-bar to automatically move towardthe table and clamp material placed thereon with a predeter minedpressure and thereafter to cause the cutter-bar to move toward the tableand cut the material thereon, and means whereby both the cutter-bar andthe clamping-bar will automatically return to their normal inoperativeposition and remain there until it is desired to make the next cycle ofoperations.

27. In a paper-cutting machine the combination of supporting-frames anda suitable table attached thereto ,an automatic clamping and cuttingmechanism comprising a clamping-bar and a cutter-bar slidably mounted insaid supporting-frames, and a single operating-lever, controlling meansand a counterb alancing device for causing the clamping-bar to movetoward the work-table and to clamp the material to be cut withapredetermined pres sure, and means whereby the cutter-bar will becaused to move toward the table and cut the material after apredetermined pressure exerted by the clampingbar, and means operatedfrom the driving-shaft to cause said cutter-bar and clamping-bar toautomatically return to their normal inoperative positions.

28. In a paper-cutting machine the combination of a clamping-bar, aworm-shaft capable of moving longitudinally in one direction, means forimp arting a vertical movement to the clamping-bar operated by thewormshaft, a counterbalancing device resisting the longitudinal movementof the wormshaft, and means for driving and stopping the Worm-shaft.

In testimony whereof I have affixed my signature in presence of twowitnesses.

FRANK L. CROSS.

Witnesses:

IRA L. Fisir, KAT ARINE A. DUGAN.

